// Copyright (c) 2009-2010 Satoshi Nakamoto
// Copyright (c) 2009-2014 The Bitcoin developers
// Copyright (c) 2014-2015 The Dash developers
// Copyright (c) 2011-2013 The PPCoin developers
// Copyright (c) 2013-2014 The NovaCoin Developers
// Copyright (c) 2014-2018 The BlackCoin Developers
// Copyright (c) 2015-2020 The PIVX developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.

#if defined(HAVE_CONFIG_H)
#include "config/sap-config.h"
#endif

#include "init.h"

#include "activemasternode.h"
#include "addrman.h"
#include "amount.h"
#include "checkpoints.h"
#include "compat/sanity.h"
#include "consensus/zerocoin_verify.h"
#include "httpserver.h"
#include "httprpc.h"
#include "invalid.h"
#include "key.h"
#include "main.h"
#include "masternode-budget.h"
#include "masternode-payments.h"
#include "masternodeconfig.h"
#include "masternodeman.h"
#include "messagesigner.h"
#include "miner.h"
#include "net.h"
#include "rpc/server.h"
#include "script/standard.h"
#include "scheduler.h"
#include "spork.h"
#include "sporkdb.h"
#include "txdb.h"
#include "torcontrol.h"
#include "guiinterface.h"
#include "guiinterfaceutil.h"
#include "util.h"
#include "utilmoneystr.h"
#include "util/threadnames.h"
#include "validationinterface.h"
#include "zpivchain.h"

#ifdef ENABLE_WALLET
#include "wallet/db.h"
#include "wallet/wallet.h"
#include "wallet/walletdb.h"

#endif

#include <fstream>
#include <stdint.h>
#include <stdio.h>

#ifndef WIN32
#include <signal.h>
#endif

#include <boost/algorithm/string/predicate.hpp>
#include <boost/algorithm/string/replace.hpp>
#include <boost/filesystem.hpp>
#include <boost/interprocess/sync/file_lock.hpp>
#include <boost/thread.hpp>
#include <boost/foreach.hpp>

#if ENABLE_ZMQ
#include "zmq/zmqnotificationinterface.h"
#endif


#ifdef ENABLE_WALLET
CzPIVWallet* zwalletMain = NULL;
int nWalletBackups = 10;
#endif
volatile bool fFeeEstimatesInitialized = false;
volatile bool fRestartRequested = false; // true: restart false: shutdown

#if ENABLE_ZMQ
static CZMQNotificationInterface* pzmqNotificationInterface = NULL;
#endif

#ifdef WIN32
// Win32 LevelDB doesn't use filedescriptors, and the ones used for
// accessing block files, don't count towards to fd_set size limit
// anyway.
#define MIN_CORE_FILEDESCRIPTORS 0
#else
#define MIN_CORE_FILEDESCRIPTORS 150
#endif

/** Used to pass flags to the Bind() function */
enum BindFlags {
    BF_NONE = 0,
    BF_EXPLICIT = (1U << 0),
    BF_REPORT_ERROR = (1U << 1),
    BF_WHITELIST = (1U << 2),
};

static const char* FEE_ESTIMATES_FILENAME = "fee_estimates.dat";
CClientUIInterface uiInterface;

//////////////////////////////////////////////////////////////////////////////
//
// Shutdown
//

//
// Thread management and startup/shutdown:
//
// The network-processing threads are all part of a thread group
// created by AppInit() or the Qt main() function.
//
// A clean exit happens when StartShutdown() or the SIGTERM
// signal handler sets fRequestShutdown, which triggers
// the DetectShutdownThread(), which interrupts the main thread group.
// DetectShutdownThread() then exits, which causes AppInit() to
// continue (it .joins the shutdown thread).
// Shutdown() is then
// called to clean up database connections, and stop other
// threads that should only be stopped after the main network-processing
// threads have exited.
//
// Note that if running -daemon the parent process returns from AppInit2
// before adding any threads to the threadGroup, so .join_all() returns
// immediately and the parent exits from main().
//
// Shutdown for Qt is very similar, only it uses a QTimer to detect
// fRequestShutdown getting set, and then does the normal Qt
// shutdown thing.
//

volatile bool fRequestShutdown = false;

void StartShutdown()
{
    fRequestShutdown = true;
}
bool ShutdownRequested()
{
    return fRequestShutdown || fRestartRequested;
}

class CCoinsViewErrorCatcher : public CCoinsViewBacked
{
public:
    CCoinsViewErrorCatcher(CCoinsView* view) : CCoinsViewBacked(view) {}
    bool GetCoins(const uint256& txid, CCoins& coins) const
    {
        try {
            return CCoinsViewBacked::GetCoins(txid, coins);
        } catch (const std::runtime_error& e) {
            uiInterface.ThreadSafeMessageBox(_("Error reading from database, shutting down."), "", CClientUIInterface::MSG_ERROR);
            LogPrintf("Error reading from database: %s\n", e.what());
            // Starting the shutdown sequence and returning false to the caller would be
            // interpreted as 'entry not found' (as opposed to unable to read data), and
            // could lead to invalid interpration. Just exit immediately, as we can't
            // continue anyway, and all writes should be atomic.
            abort();
        }
    }
    // Writes do not need similar protection, as failure to write is handled by the caller.
};

static CCoinsViewDB* pcoinsdbview = NULL;
static CCoinsViewErrorCatcher* pcoinscatcher = NULL;
static boost::scoped_ptr<ECCVerifyHandle> globalVerifyHandle;

static boost::thread_group threadGroup;
static CScheduler scheduler;
void Interrupt()
{
    InterruptHTTPServer();
    InterruptHTTPRPC();
    InterruptRPC();
    InterruptREST();
    InterruptTorControl();
}

/** Preparing steps before shutting down or restarting the wallet */
void PrepareShutdown()
{
    fRequestShutdown = true;  // Needed when we shutdown the wallet
    fRestartRequested = true; // Needed when we restart the wallet
    LogPrintf("%s: In progress...\n", __func__);
    static RecursiveMutex cs_Shutdown;
    TRY_LOCK(cs_Shutdown, lockShutdown);
    if (!lockShutdown)
        return;

    /// Note: Shutdown() must be able to handle cases in which AppInit2() failed part of the way,
    /// for example if the data directory was found to be locked.
    /// Be sure that anything that writes files or flushes caches only does this if the respective
    /// module was initialized.
    util::ThreadRename("pivx-shutoff");
    mempool.AddTransactionsUpdated(1);
    StopHTTPRPC();
    StopREST();
    StopRPC();
    StopHTTPServer();
#ifdef ENABLE_WALLET
    if (pwalletMain)
        bitdb.Flush(false);
    GenerateBitcoins(false, NULL, 0);
#endif
    StopNode();
    DumpMasternodes();
    DumpBudgets();
    DumpMasternodePayments();
    UnregisterNodeSignals(GetNodeSignals());

    // After everything has been shut down, but before things get flushed, stop the
    // CScheduler/checkqueue threadGroup
    threadGroup.interrupt_all();
    threadGroup.join_all();

    if (fFeeEstimatesInitialized) {
        boost::filesystem::path est_path = GetDataDir() / FEE_ESTIMATES_FILENAME;
        CAutoFile est_fileout(fopen(est_path.string().c_str(), "wb"), SER_DISK, CLIENT_VERSION);
        if (!est_fileout.IsNull())
            mempool.WriteFeeEstimates(est_fileout);
        else
            LogPrintf("%s: Failed to write fee estimates to %s\n", __func__, est_path.string());
        fFeeEstimatesInitialized = false;
    }

    {
        LOCK(cs_main);
        if (pcoinsTip != NULL) {
            FlushStateToDisk();

            //record that client took the proper shutdown procedure
            pblocktree->WriteFlag("shutdown", true);
        }
        delete pcoinsTip;
        pcoinsTip = NULL;
        delete pcoinscatcher;
        pcoinscatcher = NULL;
        delete pcoinsdbview;
        pcoinsdbview = NULL;
        delete pblocktree;
        pblocktree = NULL;
        delete zerocoinDB;
        zerocoinDB = NULL;
        delete pSporkDB;
        pSporkDB = NULL;
    }
#ifdef ENABLE_WALLET
    if (pwalletMain)
        bitdb.Flush(true);
#endif

#if ENABLE_ZMQ
    if (pzmqNotificationInterface) {
        UnregisterValidationInterface(pzmqNotificationInterface);
        delete pzmqNotificationInterface;
        pzmqNotificationInterface = NULL;
    }
#endif

    // Disconnect all slots
    UnregisterAllValidationInterfaces();

#ifndef WIN32
    try {
        boost::filesystem::remove(GetPidFile());
    } catch (const boost::filesystem::filesystem_error& e) {
        LogPrintf("%s: Unable to remove pidfile: %s\n", __func__, e.what());
    }
#endif
}

/**
* Shutdown is split into 2 parts:
* Part 1: shut down everything but the main wallet instance (done in PrepareShutdown() )
* Part 2: delete wallet instance
*
* In case of a restart PrepareShutdown() was already called before, but this method here gets
* called implicitly when the parent object is deleted. In this case we have to skip the
* PrepareShutdown() part because it was already executed and just delete the wallet instance.
*/
void Shutdown()
{
    // Shutdown part 1: prepare shutdown
    if (!fRestartRequested) {
        PrepareShutdown();
    }
    // Shutdown part 2: Stop TOR thread and delete wallet instance
    StopTorControl();
#ifdef ENABLE_WALLET
    delete pwalletMain;
    pwalletMain = NULL;
    delete zwalletMain;
    zwalletMain = NULL;
#endif
    globalVerifyHandle.reset();
    ECC_Stop();
    LogPrintf("%s: done\n", __func__);
}

/**
 * Signal handlers are very limited in what they are allowed to do, so:
 */
void HandleSIGTERM(int)
{
    StartShutdown();
}

void HandleSIGHUP(int)
{
    g_logger->m_reopen_file = true;
}

#ifndef WIN32
static void registerSignalHandler(int signal, void(*handler)(int))
{
    struct sigaction sa;
    sa.sa_handler = handler;
    sigemptyset(&sa.sa_mask);
    sa.sa_flags = 0;
    sigaction(signal, &sa, nullptr);
}
#endif

bool static Bind(const CService& addr, unsigned int flags)
{
    if (!(flags & BF_EXPLICIT) && IsLimited(addr))
        return false;
    std::string strError;
    if (!BindListenPort(addr, strError, (flags & BF_WHITELIST) != 0)) {
        if (flags & BF_REPORT_ERROR)
            return UIError(strError);
        return false;
    }
    return true;
}

void OnRPCStarted()
{
    uiInterface.NotifyBlockTip.connect(RPCNotifyBlockChange);
}

void OnRPCStopped()
{
    uiInterface.NotifyBlockTip.disconnect(RPCNotifyBlockChange);
    //RPCNotifyBlockChange(0);
    g_best_block_cv.notify_all();
    LogPrint(BCLog::RPC, "RPC stopped.\n");
}

void OnRPCPreCommand(const CRPCCommand& cmd)
{
#ifdef ENABLE_WALLET
    if (cmd.reqWallet && !pwalletMain)
        throw JSONRPCError(RPC_METHOD_NOT_FOUND, "Method not found (disabled)");
#endif

    // Observe safe mode
    std::string strWarning = GetWarnings("rpc");
    if (strWarning != "" && !GetBoolArg("-disablesafemode", false) &&
        !cmd.okSafeMode)
        throw JSONRPCError(RPC_FORBIDDEN_BY_SAFE_MODE, std::string("Safe mode: ") + strWarning);
}

std::string HelpMessage(HelpMessageMode mode)
{

    // When adding new options to the categories, please keep and ensure alphabetical ordering.
    std::string strUsage = HelpMessageGroup(_("Options:"));
    strUsage += HelpMessageOpt("-?", _("This help message"));
    strUsage += HelpMessageOpt("-version", _("Print version and exit"));
    strUsage += HelpMessageOpt("-alertnotify=<cmd>", _("Execute command when a relevant alert is received or we see a really long fork (%s in cmd is replaced by message)"));
    strUsage += HelpMessageOpt("-blocknotify=<cmd>", _("Execute command when the best block changes (%s in cmd is replaced by block hash)"));
    strUsage += HelpMessageOpt("-blocksizenotify=<cmd>", _("Execute command when the best block changes and its size is over (%s in cmd is replaced by block hash, %d with the block size)"));
    strUsage += HelpMessageOpt("-checkblocks=<n>", strprintf(_("How many blocks to check at startup (default: %u, 0 = all)"), 500));
    strUsage += HelpMessageOpt("-conf=<file>", strprintf(_("Specify configuration file (default: %s)"), "sap.conf"));
    if (mode == HMM_BITCOIND) {
#if !defined(WIN32)
        strUsage += HelpMessageOpt("-daemon", _("Run in the background as a daemon and accept commands"));
#endif
    }
    strUsage += HelpMessageOpt("-datadir=<dir>", _("Specify data directory"));
    strUsage += HelpMessageOpt("-debuglogfile=<file>", strprintf(_("Specify location of debug log file: this can be an absolute path or a path relative to the data directory (default: %s)"), DEFAULT_DEBUGLOGFILE));
    strUsage += HelpMessageOpt("-dbcache=<n>", strprintf(_("Set database cache size in megabytes (%d to %d, default: %d)"), nMinDbCache, nMaxDbCache, nDefaultDbCache));
    strUsage += HelpMessageOpt("-loadblock=<file>", _("Imports blocks from external blk000??.dat file") + " " + _("on startup"));
    strUsage += HelpMessageOpt("-maxreorg=<n>", strprintf(_("Set the Maximum reorg depth (default: %u)"), DEFAULT_MAX_REORG_DEPTH));
    strUsage += HelpMessageOpt("-maxorphantx=<n>", strprintf(_("Keep at most <n> unconnectable transactions in memory (default: %u)"), DEFAULT_MAX_ORPHAN_TRANSACTIONS));
    strUsage += HelpMessageOpt("-par=<n>", strprintf(_("Set the number of script verification threads (%u to %d, 0 = auto, <0 = leave that many cores free, default: %d)"), -(int)boost::thread::hardware_concurrency(), MAX_SCRIPTCHECK_THREADS, DEFAULT_SCRIPTCHECK_THREADS));
#ifndef WIN32
    strUsage += HelpMessageOpt("-pid=<file>", strprintf(_("Specify pid file (default: %s)"), "pivxd.pid"));
#endif
    strUsage += HelpMessageOpt("-reindex", _("Rebuild block chain index from current blk000??.dat files") + " " + _("on startup"));
    strUsage += HelpMessageOpt("-reindexmoneysupply", _("Reindex the SAPP and zSAPP money supply statistics") + " " + _("on startup"));
    strUsage += HelpMessageOpt("-resync", _("Delete blockchain folders and resync from scratch") + " " + _("on startup"));
#if !defined(WIN32)
    strUsage += HelpMessageOpt("-sysperms", _("Create new files with system default permissions, instead of umask 077 (only effective with disabled wallet functionality)"));
#endif
    strUsage += HelpMessageOpt("-txindex", strprintf(_("Maintain a full transaction index, used by the getrawtransaction rpc call (default: %u)"), 0));
    strUsage += HelpMessageOpt("-forcestart", _("Attempt to force blockchain corruption recovery") + " " + _("on startup"));

    strUsage += HelpMessageGroup(_("Connection options:"));
    strUsage += HelpMessageOpt("-addnode=<ip>", _("Add a node to connect to and attempt to keep the connection open"));
    strUsage += HelpMessageOpt("-banscore=<n>", strprintf(_("Threshold for disconnecting misbehaving peers (default: %u)"), 100));
    strUsage += HelpMessageOpt("-bantime=<n>", strprintf(_("Number of seconds to keep misbehaving peers from reconnecting (default: %u)"), 86400));
    strUsage += HelpMessageOpt("-bind=<addr>", _("Bind to given address and always listen on it. Use [host]:port notation for IPv6"));
    strUsage += HelpMessageOpt("-connect=<ip>", _("Connect only to the specified node(s)"));
    strUsage += HelpMessageOpt("-discover", _("Discover own IP address (default: 1 when listening and no -externalip)"));
    strUsage += HelpMessageOpt("-dns", _("Allow DNS lookups for -addnode, -seednode and -connect") + " " + _("(default: 1)"));
    strUsage += HelpMessageOpt("-dnsseed", _("Query for peer addresses via DNS lookup, if low on addresses (default: 1 unless -connect)"));
    strUsage += HelpMessageOpt("-externalip=<ip>", _("Specify your own public address"));
    strUsage += HelpMessageOpt("-forcednsseed", strprintf(_("Always query for peer addresses via DNS lookup (default: %u)"), 0));
    strUsage += HelpMessageOpt("-listen", _("Accept connections from outside (default: 1 if no -proxy or -connect)"));
    strUsage += HelpMessageOpt("-listenonion", strprintf(_("Automatically create Tor hidden service (default: %d)"), DEFAULT_LISTEN_ONION));
    strUsage += HelpMessageOpt("-maxconnections=<n>", strprintf(_("Maintain at most <n> connections to peers (default: %u)"), DEFAULT_MAX_PEER_CONNECTIONS));
    strUsage += HelpMessageOpt("-maxreceivebuffer=<n>", strprintf(_("Maximum per-connection receive buffer, <n>*1000 bytes (default: %u)"), 5000));
    strUsage += HelpMessageOpt("-maxsendbuffer=<n>", strprintf(_("Maximum per-connection send buffer, <n>*1000 bytes (default: %u)"), 1000));
    strUsage += HelpMessageOpt("-onion=<ip:port>", strprintf(_("Use separate SOCKS5 proxy to reach peers via Tor hidden services (default: %s)"), "-proxy"));
    strUsage += HelpMessageOpt("-onlynet=<net>", _("Only connect to nodes in network <net> (ipv4, ipv6 or onion)"));
    strUsage += HelpMessageOpt("-permitbaremultisig", strprintf(_("Relay non-P2SH multisig (default: %u)"), 1));
    strUsage += HelpMessageOpt("-peerbloomfilters", strprintf(_("Support filtering of blocks and transaction with bloom filters (default: %u)"), DEFAULT_PEERBLOOMFILTERS));
    strUsage += HelpMessageOpt("-port=<port>", strprintf(_("Listen for connections on <port> (default: %u or testnet: %u)"), 45328, 51474));
    strUsage += HelpMessageOpt("-proxy=<ip:port>", _("Connect through SOCKS5 proxy"));
    strUsage += HelpMessageOpt("-proxyrandomize", strprintf(_("Randomize credentials for every proxy connection. This enables Tor stream isolation (default: %u)"), 1));
    strUsage += HelpMessageOpt("-seednode=<ip>", _("Connect to a node to retrieve peer addresses, and disconnect"));
    strUsage += HelpMessageOpt("-timeout=<n>", strprintf(_("Specify connection timeout in milliseconds (minimum: 1, default: %d)"), DEFAULT_CONNECT_TIMEOUT));
    strUsage += HelpMessageOpt("-torcontrol=<ip>:<port>", strprintf(_("Tor control port to use if onion listening enabled (default: %s)"), DEFAULT_TOR_CONTROL));
    strUsage += HelpMessageOpt("-torpassword=<pass>", _("Tor control port password (default: empty)"));
#ifdef USE_UPNP
#if USE_UPNP
    strUsage += HelpMessageOpt("-upnp", _("Use UPnP to map the listening port (default: 1 when listening)"));
#else
    strUsage += HelpMessageOpt("-upnp", strprintf(_("Use UPnP to map the listening port (default: %u)"), 0));
#endif
#endif
    strUsage += HelpMessageOpt("-whitebind=<addr>", _("Bind to given address and whitelist peers connecting to it. Use [host]:port notation for IPv6"));
    strUsage += HelpMessageOpt("-whitelist=<netmask>", _("Whitelist peers connecting from the given netmask or IP address. Can be specified multiple times.") +
        " " + _("Whitelisted peers cannot be DoS banned and their transactions are always relayed, even if they are already in the mempool, useful e.g. for a gateway"));


#ifdef ENABLE_WALLET
    strUsage += HelpMessageGroup(_("Wallet options:"));
    strUsage += HelpMessageOpt("-backuppath=<dir|file>", _("Specify custom backup path to add a copy of any wallet backup. If set as dir, every backup generates a timestamped file. If set as file, will rewrite to that file every backup."));
    strUsage += HelpMessageOpt("-createwalletbackups=<n>", _("Number of automatic wallet backups (default: 10)"));
    strUsage += HelpMessageOpt("-custombackupthreshold=<n>", strprintf(_("Number of custom location backups to retain (default: %d)"), DEFAULT_CUSTOMBACKUPTHRESHOLD));
    strUsage += HelpMessageOpt("-disablewallet", _("Do not load the wallet and disable wallet RPC calls"));
    strUsage += HelpMessageOpt("-keypool=<n>", strprintf(_("Set key pool size to <n> (default: %u)"), 100));
    if (GetBoolArg("-help-debug", false))
        strUsage += HelpMessageOpt("-mintxfee=<amt>", strprintf(_("Fees (in SAPP/Kb) smaller than this are considered zero fee for transaction creation (default: %s)"),
            FormatMoney(CWallet::minTxFee.GetFeePerK())));
    strUsage += HelpMessageOpt("-paytxfee=<amt>", strprintf(_("Fee (in SAPP/kB) to add to transactions you send (default: %s)"), FormatMoney(payTxFee.GetFeePerK())));
    strUsage += HelpMessageOpt("-rescan", _("Rescan the block chain for missing wallet transactions") + " " + _("on startup"));
    strUsage += HelpMessageOpt("-salvagewallet", _("Attempt to recover private keys from a corrupt wallet.dat") + " " + _("on startup"));
    strUsage += HelpMessageOpt("-sendfreetransactions", strprintf(_("Send transactions as zero-fee transactions if possible (default: %u)"), 0));
    strUsage += HelpMessageOpt("-spendzeroconfchange", strprintf(_("Spend unconfirmed change when sending transactions (default: %u)"), 1));
    strUsage += HelpMessageOpt("-disablesystemnotifications", strprintf(_("Disable OS notifications for incoming transactions (default: %u)"), 0));
    strUsage += HelpMessageOpt("-txconfirmtarget=<n>", strprintf(_("If paytxfee is not set, include enough fee so transactions begin confirmation on average within n blocks (default: %u)"), 1));
    strUsage += HelpMessageOpt("-maxtxfee=<amt>", strprintf(_("Maximum total fees to use in a single wallet transaction, setting too low may abort large transactions (default: %s)"),
        FormatMoney(maxTxFee)));
    strUsage += HelpMessageOpt("-legacywallet", _("On first run, create a legacy wallet instead of a HD wallet"));
    strUsage += HelpMessageOpt("-upgradewallet", _("Upgrade wallet to latest format") + " " + _("on startup"));
    strUsage += HelpMessageOpt("-wallet=<file>", _("Specify wallet file (within data directory)") + " " + strprintf(_("(default: %s)"), "wallet.dat"));
    strUsage += HelpMessageOpt("-walletnotify=<cmd>", _("Execute command when a wallet transaction changes (%s in cmd is replaced by TxID)"));
    if (mode == HMM_BITCOIN_QT)
        strUsage += HelpMessageOpt("-windowtitle=<name>", _("Wallet window title"));
    strUsage += HelpMessageOpt("-zapwallettxes=<mode>", _("Delete all wallet transactions and only recover those parts of the blockchain through -rescan on startup") +
        " " + _("(1 = keep tx meta data e.g. account owner and payment request information, 2 = drop tx meta data)"));
#endif

#if ENABLE_ZMQ
    strUsage += HelpMessageGroup(_("ZeroMQ notification options:"));
    strUsage += HelpMessageOpt("-zmqpubhashblock=<address>", _("Enable publish hash block in <address>"));
    strUsage += HelpMessageOpt("-zmqpubhashtx=<address>", _("Enable publish hash transaction in <address>"));
    strUsage += HelpMessageOpt("-zmqpubhashtxlock=<address>", _("Enable publish hash transaction (locked via SwiftX) in <address>"));
    strUsage += HelpMessageOpt("-zmqpubrawblock=<address>", _("Enable publish raw block in <address>"));
    strUsage += HelpMessageOpt("-zmqpubrawtx=<address>", _("Enable publish raw transaction in <address>"));
    strUsage += HelpMessageOpt("-zmqpubrawtxlock=<address>", _("Enable publish raw transaction (locked via SwiftX) in <address>"));
#endif

    strUsage += HelpMessageGroup(_("Debugging/Testing options:"));
    strUsage += HelpMessageOpt("-uacomment=<cmt>", _("Append comment to the user agent string"));
    if (GetBoolArg("-help-debug", false)) {
        strUsage += HelpMessageOpt("-checkblockindex", strprintf("Do a full consistency check for mapBlockIndex, setBlockIndexCandidates, chainActive and mapBlocksUnlinked occasionally. Also sets -checkmempool (default: %u)", Params(CBaseChainParams::MAIN).DefaultConsistencyChecks()));
        strUsage += HelpMessageOpt("-checkmempool=<n>", strprintf("Run checks every <n> transactions (default: %u)", Params(CBaseChainParams::MAIN).DefaultConsistencyChecks()));
        strUsage += HelpMessageOpt("-checkpoints", strprintf(_("Only accept block chain matching built-in checkpoints (default: %u)"), 1));
        strUsage += HelpMessageOpt("-dblogsize=<n>", strprintf(_("Flush database activity from memory pool to disk log every <n> megabytes (default: %u)"), 100));
        strUsage += HelpMessageOpt("-disablesafemode", strprintf(_("Disable safemode, override a real safe mode event (default: %u)"), 0));
        strUsage += HelpMessageOpt("-testsafemode", strprintf(_("Force safe mode (default: %u)"), 0));
        strUsage += HelpMessageOpt("-dropmessagestest=<n>", _("Randomly drop 1 of every <n> network messages"));
        strUsage += HelpMessageOpt("-fuzzmessagestest=<n>", _("Randomly fuzz 1 of every <n> network messages"));
        strUsage += HelpMessageOpt("-flushwallet", strprintf(_("Run a thread to flush wallet periodically (default: %u)"), 1));
        strUsage += HelpMessageOpt("-maxreorg", strprintf(_("Use a custom max chain reorganization depth (default: %u)"), 100));
        strUsage += HelpMessageOpt("-stopafterblockimport", strprintf(_("Stop running after importing blocks from disk (default: %u)"), 0));
        strUsage += HelpMessageOpt("-sporkkey=<privkey>", _("Enable spork administration functionality with the appropriate private key."));
    }
    strUsage += HelpMessageOpt("-debug=<category>", strprintf(_("Output debugging information (default: %u, supplying <category> is optional)"), 0) + ". " +
        _("If <category> is not supplied, output all debugging information.") + _("<category> can be:") + " " + ListLogCategories() + ".");
    strUsage += HelpMessageOpt("-debugexclude=<category>", _("Exclude debugging information for a category. Can be used in conjunction with -debug=1 to output debug logs for all categories except one or more specified categories."));
    if (GetBoolArg("-help-debug", false))
        strUsage += HelpMessageOpt("-nodebug", "Turn off debugging messages, same as -debug=0");
#ifdef ENABLE_WALLET
    strUsage += HelpMessageOpt("-gen", strprintf(_("Generate coins (default: %u)"), 0));
    strUsage += HelpMessageOpt("-genproclimit=<n>", strprintf(_("Set the number of threads for coin generation if enabled (-1 = all cores, default: %d)"), 1));
#endif
    strUsage += HelpMessageOpt("-help-debug", _("Show all debugging options (usage: --help -help-debug)"));
    strUsage += HelpMessageOpt("-logips", strprintf(_("Include IP addresses in debug output (default: %u)"), 0));
    strUsage += HelpMessageOpt("-logtimestamps", strprintf(_("Prepend debug output with timestamp (default: %u)"), 1));
    strUsage += HelpMessageOpt("-logtimemicros", strprintf("Add microsecond precision to debug timestamps (default: %u)", DEFAULT_LOGTIMEMICROS));
    if (GetBoolArg("-help-debug", false)) {
        strUsage += HelpMessageOpt("-limitfreerelay=<n>", strprintf(_("Continuously rate-limit free transactions to <n>*1000 bytes per minute (default:%u)"), 15));
        strUsage += HelpMessageOpt("-relaypriority", strprintf(_("Require high priority for relaying free or low-fee transactions (default:%u)"), 1));
        strUsage += HelpMessageOpt("-maxsigcachesize=<n>", strprintf(_("Limit size of signature cache to <n> entries (default: %u)"), 50000));
    }
    strUsage += HelpMessageOpt("-maxtipage=<n>", strprintf("Maximum tip age in seconds to consider node in initial block download (default: %u)", DEFAULT_MAX_TIP_AGE));
    strUsage += HelpMessageOpt("-minrelaytxfee=<amt>", strprintf(_("Fees (in SAPP/Kb) smaller than this are considered zero fee for relaying (default: %s)"), FormatMoney(::minRelayTxFee.GetFeePerK())));
    strUsage += HelpMessageOpt("-printtoconsole", strprintf(_("Send trace/debug info to console instead of debug.log file (default: %u)"), 0));
    if (GetBoolArg("-help-debug", false)) {
        strUsage += HelpMessageOpt("-printpriority", strprintf(_("Log transaction priority and fee per kB when mining blocks (default: %u)"), 0));
        strUsage += HelpMessageOpt("-privdb", strprintf(_("Sets the DB_PRIVATE flag in the wallet db environment (default: %u)"), 1));
        strUsage += HelpMessageOpt("-regtest", _("Enter regression test mode, which uses a special chain in which blocks can be solved instantly.") + " " +
            _("This is intended for regression testing tools and app development.") + " " +
            _("In this mode -genproclimit controls how many blocks are generated immediately."));
    }
    strUsage += HelpMessageOpt("-shrinkdebugfile", _("Shrink debug.log file on client startup (default: 1 when no -debug)"));
    strUsage += HelpMessageOpt("-testnet", _("Use the test network"));
    strUsage += HelpMessageOpt("-litemode=<n>", strprintf(_("Disable all Sap specific functionality (Masternodes, Zerocoin, SwiftX, Budgeting) (0-1, default: %u)"), 0));

#ifdef ENABLE_WALLET
    strUsage += HelpMessageGroup(_("Staking options:"));
    strUsage += HelpMessageOpt("-staking=<n>", strprintf(_("Enable staking functionality (0-1, default: %u)"), 1));
    strUsage += HelpMessageOpt("-coldstaking=<n>", strprintf(_("Enable cold staking functionality (0-1, default: %u). Disabled if staking=0"), 1));
    strUsage += HelpMessageOpt("-pivstake=<n>", strprintf(_("Enable or disable staking functionality for SAPP inputs (0-1, default: %u)"), 1));
    strUsage += HelpMessageOpt("-zpivstake=<n>", strprintf(_("Enable or disable staking functionality for zSAPP inputs (0-1, default: %u)"), 1));
    strUsage += HelpMessageOpt("-reservebalance=<amt>", _("Keep the specified amount available for spending at all times (default: 0)"));
    if (GetBoolArg("-help-debug", false)) {
        strUsage += HelpMessageOpt("-printstakemodifier", _("Display the stake modifier calculations in the debug.log file."));
        strUsage += HelpMessageOpt("-printcoinstake", _("Display verbose coin stake messages in the debug.log file."));
    }
#endif

    strUsage += HelpMessageGroup(_("Masternode options:"));
    strUsage += HelpMessageOpt("-masternode=<n>", strprintf(_("Enable the client to act as a masternode (0-1, default: %u)"), 0));
    strUsage += HelpMessageOpt("-mnconf=<file>", strprintf(_("Specify masternode configuration file (default: %s)"), "masternode.conf"));
    strUsage += HelpMessageOpt("-mnconflock=<n>", strprintf(_("Lock masternodes from masternode configuration file (default: %u)"), 1));
    strUsage += HelpMessageOpt("-masternodeprivkey=<n>", _("Set the masternode private key"));
    strUsage += HelpMessageOpt("-masternodeaddr=<n>", strprintf(_("Set external address:port to get to this masternode (example: %s)"), "128.127.106.235:45328"));
    strUsage += HelpMessageOpt("-budgetvotemode=<mode>", _("Change automatic finalized budget voting behavior. mode=auto: Vote for only exact finalized budget match to my generated budget. (string, default: auto)"));

    strUsage += HelpMessageGroup(_("Zerocoin options:"));
    strUsage += HelpMessageOpt("-reindexzerocoin=<n>", strprintf(_("Delete all zerocoin spends and mints that have been recorded to the blockchain database and reindex them (0-1, default: %u)"), 0));

    strUsage += HelpMessageGroup(_("SwiftX options:"));
    strUsage += HelpMessageOpt("-enableswifttx=<n>", strprintf(_("Enable SwiftX, show confirmations for locked transactions (bool, default: %s)"), "true"));
    strUsage += HelpMessageOpt("-swifttxdepth=<n>", strprintf(_("Show N confirmations for a successfully locked transaction (0-9999, default: %u)"), nSwiftTXDepth));

    strUsage += HelpMessageGroup(_("Node relay options:"));
    strUsage += HelpMessageOpt("-datacarrier", strprintf(_("Relay and mine data carrier transactions (default: %u)"), 1));
    strUsage += HelpMessageOpt("-datacarriersize", strprintf(_("Maximum size of data in data carrier transactions we relay and mine (default: %u)"), MAX_OP_RETURN_RELAY));
    if (GetBoolArg("-help-debug", false)) {
        strUsage += HelpMessageOpt("-blockversion=<n>", "Override block version to test forking scenarios");
    }

    strUsage += HelpMessageGroup(_("Block creation options:"));
    strUsage += HelpMessageOpt("-blockminsize=<n>", strprintf(_("Set minimum block size in bytes (default: %u)"), 0));
    strUsage += HelpMessageOpt("-blockmaxsize=<n>", strprintf(_("Set maximum block size in bytes (default: %d)"), DEFAULT_BLOCK_MAX_SIZE));
    strUsage += HelpMessageOpt("-blockprioritysize=<n>", strprintf(_("Set maximum size of high-priority/low-fee transactions in bytes (default: %d)"), DEFAULT_BLOCK_PRIORITY_SIZE));

    strUsage += HelpMessageGroup(_("RPC server options:"));
    strUsage += HelpMessageOpt("-server", _("Accept command line and JSON-RPC commands"));
    strUsage += HelpMessageOpt("-rest", strprintf(_("Accept public REST requests (default: %u)"), 0));
    strUsage += HelpMessageOpt("-rpcbind=<addr>", _("Bind to given address to listen for JSON-RPC connections. Use [host]:port notation for IPv6. This option can be specified multiple times (default: bind to all interfaces)"));
    strUsage += HelpMessageOpt("-rpccookiefile=<loc>", _("Location of the auth cookie (default: data dir)"));
    strUsage += HelpMessageOpt("-rpcuser=<user>", _("Username for JSON-RPC connections"));
    strUsage += HelpMessageOpt("-rpcpassword=<pw>", _("Password for JSON-RPC connections"));
    strUsage += HelpMessageOpt("-rpcport=<port>", strprintf(_("Listen for JSON-RPC connections on <port> (default: %u or testnet: %u)"), 45329, 51475));
    strUsage += HelpMessageOpt("-rpcallowip=<ip>", _("Allow JSON-RPC connections from specified source. Valid for <ip> are a single IP (e.g. 1.2.3.4), a network/netmask (e.g. 1.2.3.4/255.255.255.0) or a network/CIDR (e.g. 1.2.3.4/24). This option can be specified multiple times"));
    strUsage += HelpMessageOpt("-rpcthreads=<n>", strprintf(_("Set the number of threads to service RPC calls (default: %d)"), DEFAULT_HTTP_THREADS));
    if (GetBoolArg("-help-debug", false)) {
        strUsage += HelpMessageOpt("-rpcworkqueue=<n>", strprintf("Set the depth of the work queue to service RPC calls (default: %d)", DEFAULT_HTTP_WORKQUEUE));
        strUsage += HelpMessageOpt("-rpcservertimeout=<n>", strprintf("Timeout during HTTP requests (default: %d)", DEFAULT_HTTP_SERVER_TIMEOUT));
    }

    strUsage += HelpMessageOpt("-blockspamfilter=<n>", strprintf(_("Use block spam filter (default: %u)"), DEFAULT_BLOCK_SPAM_FILTER));
    strUsage += HelpMessageOpt("-blockspamfiltermaxsize=<n>", strprintf(_("Maximum size of the list of indexes in the block spam filter (default: %u)"), DEFAULT_BLOCK_SPAM_FILTER_MAX_SIZE));
    strUsage += HelpMessageOpt("-blockspamfiltermaxavg=<n>", strprintf(_("Maximum average size of an index occurrence in the block spam filter (default: %u)"), DEFAULT_BLOCK_SPAM_FILTER_MAX_AVG));

    return strUsage;
}

std::string LicenseInfo()
{
    return FormatParagraph(strprintf(_("Copyright (C) 2009-%i The Bitcoin Core Developers"), COPYRIGHT_YEAR)) + "\n" +
           "\n" +
           FormatParagraph(strprintf(_("Copyright (C) 2014-%i The Dash Core Developers"), COPYRIGHT_YEAR)) + "\n" +
           "\n" +
           FormatParagraph(strprintf(_("Copyright (C) 2015-%i The Sap Developers"), COPYRIGHT_YEAR)) + "\n" +
           "\n" +
           FormatParagraph(_("This is experimental software.")) + "\n" +
           "\n" +
           FormatParagraph(_("Distributed under the MIT software license, see the accompanying file COPYING or <http://www.opensource.org/licenses/mit-license.php>.")) + "\n" +
           "\n" +
           FormatParagraph(_("This product includes software developed by the OpenSSL Project for use in the OpenSSL Toolkit <https://www.openssl.org/> and cryptographic software written by Eric Young and UPnP software written by Thomas Bernard.")) +
           "\n";
}

static void BlockNotifyCallback(bool initialSync, const CBlockIndex *pBlockIndex)
{

    if (initialSync || !pBlockIndex)
        return;

    std::string strCmd = GetArg("-blocknotify", "");

    if (!strCmd.empty()) {
        boost::replace_all(strCmd, "%s", pBlockIndex->GetBlockHash().GetHex());
        std::thread t(runCommand, strCmd);
        t.detach(); // thread runs free
    }
}

static void BlockSizeNotifyCallback(int size, const uint256& hashNewTip)
{
    std::string strCmd = GetArg("-blocksizenotify", "");

    boost::replace_all(strCmd, "%s", hashNewTip.GetHex());
    boost::replace_all(strCmd, "%d", std::to_string(size));
    boost::thread t(runCommand, strCmd); // thread runs free
}

struct CImportingNow {
    CImportingNow()
    {
        assert(fImporting == false);
        fImporting = true;
    }

    ~CImportingNow()
    {
        assert(fImporting == true);
        fImporting = false;
    }
};

void ThreadImport(std::vector<boost::filesystem::path> vImportFiles)
{
    util::ThreadRename("pivx-loadblk");

    // -reindex
    if (fReindex) {
        CImportingNow imp;
        int nFile = 0;
        while (true) {
            CDiskBlockPos pos(nFile, 0);
            if (!boost::filesystem::exists(GetBlockPosFilename(pos, "blk")))
                break; // No block files left to reindex
            FILE* file = OpenBlockFile(pos, true);
            if (!file)
                break; // This error is logged in OpenBlockFile
            LogPrintf("Reindexing block file blk%05u.dat...\n", (unsigned int)nFile);
            LoadExternalBlockFile(file, &pos);
            nFile++;
        }
        pblocktree->WriteReindexing(false);
        fReindex = false;
        LogPrintf("Reindexing finished\n");
        // To avoid ending up in a situation without genesis block, re-try initializing (no-op if reindexing worked):
        InitBlockIndex();
    }

    // hardcoded $DATADIR/bootstrap.dat
    boost::filesystem::path pathBootstrap = GetDataDir() / "bootstrap.dat";
    if (boost::filesystem::exists(pathBootstrap)) {
        FILE* file = fopen(pathBootstrap.string().c_str(), "rb");
        if (file) {
            CImportingNow imp;
            boost::filesystem::path pathBootstrapOld = GetDataDir() / "bootstrap.dat.old";
            LogPrintf("Importing bootstrap.dat...\n");
            LoadExternalBlockFile(file);
            RenameOver(pathBootstrap, pathBootstrapOld);
        } else {
            LogPrintf("Warning: Could not open bootstrap file %s\n", pathBootstrap.string());
        }
    }

    // -loadblock=
    for (boost::filesystem::path& path : vImportFiles) {
        FILE* file = fopen(path.string().c_str(), "rb");
        if (file) {
            CImportingNow imp;
            LogPrintf("Importing blocks file %s...\n", path.string());
            LoadExternalBlockFile(file);
        } else {
            LogPrintf("Warning: Could not open blocks file %s\n", path.string());
        }
    }

    if (GetBoolArg("-stopafterblockimport", false)) {
        LogPrintf("Stopping after block import\n");
        StartShutdown();
    }
}

/** Sanity checks
 *  Ensure that PIVX is running in a usable environment with all
 *  necessary library support.
 */
bool InitSanityCheck(void)
{
    if (!ECC_InitSanityCheck()) {
        UIError("Elliptic curve cryptography sanity check failure. Aborting.");
        return false;
    }

    if (!glibc_sanity_test() || !glibcxx_sanity_test())
        return false;

    if (!Random_SanityCheck()) {
        UIError("OS cryptographic RNG sanity check failure. Aborting.");
        return false;
    }

    return true;
}

bool AppInitServers()
{
    RPCServer::OnStarted(&OnRPCStarted);
    RPCServer::OnStopped(&OnRPCStopped);
    RPCServer::OnPreCommand(&OnRPCPreCommand);
    if (!InitHTTPServer())
        return false;
    if (!StartRPC())
        return false;
    if (!StartHTTPRPC())
        return false;
    if (GetBoolArg("-rest", false) && !StartREST())
        return false;
    if (!StartHTTPServer())
        return false;
    return true;
}

[[noreturn]] static void new_handler_terminate()
{
    // Rather than throwing std::bad-alloc if allocation fails, terminate
    // immediately to (try to) avoid chain corruption.
    // Since LogPrintf may itself allocate memory, set the handler directly
    // to terminate first.
    std::set_new_handler(std::terminate);
    LogPrintf("Error: Out of memory. Terminating.\n");

    // The log was successful, terminate now.
    std::terminate();
};

bool AppInitBasicSetup()
{
// ********************************************************* Step 1: setup
#ifdef _MSC_VER
    // Turn off Microsoft heap dump noise
    _CrtSetReportMode(_CRT_WARN, _CRTDBG_MODE_FILE);
    _CrtSetReportFile(_CRT_WARN, CreateFileA("NUL", GENERIC_WRITE, 0, NULL, OPEN_EXISTING, 0, 0));
#endif
#if _MSC_VER >= 1400
    // Disable confusing "helpful" text message on abort, Ctrl-C
    _set_abort_behavior(0, _WRITE_ABORT_MSG | _CALL_REPORTFAULT);
#endif
#ifdef WIN32
    // Enable Data Execution Prevention (DEP)
// Minimum supported OS versions: WinXP SP3, WinVista >= SP1, Win Server 2008
// A failure is non-critical and needs no further attention!
#ifndef PROCESS_DEP_ENABLE
// We define this here, because GCCs winbase.h limits this to _WIN32_WINNT >= 0x0601 (Windows 7),
// which is not correct. Can be removed, when GCCs winbase.h is fixed!
#define PROCESS_DEP_ENABLE 0x00000001
#endif
    typedef BOOL(WINAPI * PSETPROCDEPPOL)(DWORD);
    PSETPROCDEPPOL setProcDEPPol = (PSETPROCDEPPOL)GetProcAddress(GetModuleHandleA("Kernel32.dll"), "SetProcessDEPPolicy");
    if (setProcDEPPol != NULL) setProcDEPPol(PROCESS_DEP_ENABLE);
#endif

    if (!SetupNetworking())
        return UIError("Error: Initializing networking failed");

#ifndef WIN32
    if (GetBoolArg("-sysperms", false)) {
#ifdef ENABLE_WALLET
        if (!GetBoolArg("-disablewallet", false))
            return UIError("Error: -sysperms is not allowed in combination with enabled wallet functionality");
#endif
    } else {
        umask(077);
    }

    // Clean shutdown on SIGTERMx
    registerSignalHandler(SIGTERM, HandleSIGTERM);
    registerSignalHandler(SIGINT, HandleSIGTERM);

    // Reopen debug.log on SIGHUP
    registerSignalHandler(SIGHUP, HandleSIGHUP);

    // Ignore SIGPIPE, otherwise it will bring the daemon down if the client closes unexpectedly
    signal(SIGPIPE, SIG_IGN);
#endif

    std::set_new_handler(new_handler_terminate);

    return true;
}

// Parameter interaction based on rules
void InitParameterInteraction()
{
    if (mapArgs.count("-bind") || mapArgs.count("-whitebind")) {
        // when specifying an explicit binding address, you want to listen on it
        // even when -connect or -proxy is specified
        if (SoftSetBoolArg("-listen", true))
            LogPrintf("%s : parameter interaction: -bind or -whitebind set -> setting -listen=1\n", __func__);
    }

    if (mapArgs.count("-connect") && mapMultiArgs["-connect"].size() > 0) {
        // when only connecting to trusted nodes, do not seed via DNS, or listen by default
        if (SoftSetBoolArg("-dnsseed", false))
            LogPrintf("%s : parameter interaction: -connect set -> setting -dnsseed=0\n", __func__);
        if (SoftSetBoolArg("-listen", false))
            LogPrintf("%s : parameter interaction: -connect set -> setting -listen=0\n", __func__);
    }

    if (mapArgs.count("-proxy")) {
        // to protect privacy, do not listen by default if a default proxy server is specified
        if (SoftSetBoolArg("-listen", false))
            LogPrintf("%s: parameter interaction: -proxy set -> setting -listen=0\n", __func__);
        // to protect privacy, do not use UPNP when a proxy is set. The user may still specify -listen=1
        // to listen locally, so don't rely on this happening through -listen below.
        if (SoftSetBoolArg("-upnp", false))
            LogPrintf("%s: parameter interaction: -proxy set -> setting -upnp=0\n", __func__);
        // to protect privacy, do not discover addresses by default
        if (SoftSetBoolArg("-discover", false))
            LogPrintf("%s : parameter interaction: -proxy set -> setting -discover=0\n", __func__);
    }

    if (!GetBoolArg("-listen", true)) {
        // do not map ports or try to retrieve public IP when not listening (pointless)
        if (SoftSetBoolArg("-upnp", false))
            LogPrintf("%s : parameter interaction: -listen=0 -> setting -upnp=0\n", __func__);
        if (SoftSetBoolArg("-discover", false))
            LogPrintf("%s : parameter interaction: -listen=0 -> setting -discover=0\n", __func__);
        if (SoftSetBoolArg("-listenonion", false))
            LogPrintf("%s : parameter interaction: -listen=0 -> setting -listenonion=0\n", __func__);
    }

    if (mapArgs.count("-externalip")) {
        // if an explicit public IP is specified, do not try to find others
        if (SoftSetBoolArg("-discover", false))
            LogPrintf("%s : parameter interaction: -externalip set -> setting -discover=0\n", __func__);
    }

    if (GetBoolArg("-salvagewallet", false)) {
        // Rewrite just private keys: rescan to find transactions
        if (SoftSetBoolArg("-rescan", true))
            LogPrintf("%s : parameter interaction: -salvagewallet=1 -> setting -rescan=1\n", __func__);
    }

    // -zapwallettx implies a rescan
    if (GetBoolArg("-zapwallettxes", false)) {
        if (SoftSetBoolArg("-rescan", true))
            LogPrintf("%s : parameter interaction: -zapwallettxes=<mode> -> setting -rescan=1\n", __func__);
    }

    if (!GetBoolArg("-enableswifttx", fEnableSwiftTX)) {
        if (SoftSetArg("-swifttxdepth", "0"))
            LogPrintf("%s : parameter interaction: -enableswifttx=false -> setting -nSwiftTXDepth=0\n", __func__);
    }
}

static std::string ResolveErrMsg(const char * const optname, const std::string& strBind)
{
    return strprintf(_("Cannot resolve -%s address: '%s'"), optname, strBind);
}

void InitLogging()
{
    //g_logger->m_print_to_file = !IsArgNegated("-debuglogfile");
    g_logger->m_print_to_file = true;
    g_logger->m_file_path = AbsPathForConfigVal(GetArg("-debuglogfile", DEFAULT_DEBUGLOGFILE));

    // Add newlines to the logfile to distinguish this execution from the last
    // one; called before console logging is set up, so this is only sent to
    // debug.log.
    LogPrintf("\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n");

    g_logger->m_print_to_console = GetBoolArg("-printtoconsole", !GetBoolArg("-daemon", false));
    g_logger->m_log_timestamps = GetBoolArg("-logtimestamps", DEFAULT_LOGTIMESTAMPS);
    g_logger->m_log_time_micros = GetBoolArg("-logtimemicros", DEFAULT_LOGTIMEMICROS);

    fLogIPs = GetBoolArg("-logips", DEFAULT_LOGIPS);

    std::string version_string = FormatFullVersion();
#ifdef DEBUG
    version_string += " (debug build)";
#else
    version_string += " (release build)";
#endif
    LogPrintf("SAPP version %s (%s)\n", version_string, CLIENT_DATE);
}

/** Initialize pivx.
 *  @pre Parameters should be parsed and config file should be read.
 */
bool AppInit2()
{
    // ********************************************************* Step 1: setup
    if (!AppInitBasicSetup())
        return false;

    // ********************************************************* Step 2: parameter interactions
    // Make sure enough file descriptors are available
    int nBind = std::max((int)mapArgs.count("-bind") + (int)mapArgs.count("-whitebind"), 1);
    nMaxConnections = GetArg("-maxconnections", DEFAULT_MAX_PEER_CONNECTIONS);
    nMaxConnections = std::max(std::min(nMaxConnections, (int)(FD_SETSIZE - nBind - MIN_CORE_FILEDESCRIPTORS)), 0);
    int nFD = RaiseFileDescriptorLimit(nMaxConnections + MIN_CORE_FILEDESCRIPTORS);
    if (nFD < MIN_CORE_FILEDESCRIPTORS)
        return UIError(_("Not enough file descriptors available."));
    if (nFD - MIN_CORE_FILEDESCRIPTORS < nMaxConnections)
        nMaxConnections = nFD - MIN_CORE_FILEDESCRIPTORS;

    // ********************************************************* Step 3: parameter-to-internal-flags

    // Special-case: if -debug=0/-nodebug is set, turn off debugging messages
    const std::vector<std::string>& categories = mapMultiArgs["-debug"];

    if (!(GetBoolArg("-nodebug", false) ||
            find(categories.begin(), categories.end(), std::string("0")) != categories.end())) {
        for (const auto& cat : categories) {
            if (!g_logger->EnableCategory(cat)) {
                UIWarning(strprintf(_("Unsupported logging category %s=%s."), "-debug", cat));
            }
        }
    }

    // Now remove the logging categories which were explicitly excluded
    if (mapMultiArgs.count("-debugexclude") > 0) {
        const std::vector<std::string>& excludedCategories = mapMultiArgs.at("-debugexclude");
        for (const auto& cat : excludedCategories) {
            if (!g_logger->DisableCategory(cat)) {
                UIWarning(strprintf(_("Unsupported logging category %s=%s."), "-debugexclude", cat));
            }
        }
    }

    // Check for -debugnet
    if (GetBoolArg("-debugnet", false))
        UIWarning(_("Warning: Unsupported argument -debugnet ignored, use -debug=net."));
    // Check for -socks - as this is a privacy risk to continue, exit here
    if (mapArgs.count("-socks"))
        return UIError(_("Error: Unsupported argument -socks found. Setting SOCKS version isn't possible anymore, only SOCKS5 proxies are supported."));
    // Check for -tor - as this is a privacy risk to continue, exit here
    if (GetBoolArg("-tor", false))
        return UIError(_("Error: Unsupported argument -tor found, use -onion."));
    // Check level must be 4 for zerocoin checks
    if (mapArgs.count("-checklevel"))
        return UIError(_("Error: Unsupported argument -checklevel found. Checklevel must be level 4."));

    if (GetBoolArg("-benchmark", false))
        UIWarning(_("Warning: Unsupported argument -benchmark ignored, use -debug=bench."));

    // Checkmempool and checkblockindex default to true in regtest mode
    mempool.setSanityCheck(GetBoolArg("-checkmempool", Params().DefaultConsistencyChecks()));
    fCheckBlockIndex = GetBoolArg("-checkblockindex", Params().DefaultConsistencyChecks());
    Checkpoints::fEnabled = GetBoolArg("-checkpoints", true);

    // -par=0 means autodetect, but nScriptCheckThreads==0 means no concurrency
    nScriptCheckThreads = GetArg("-par", DEFAULT_SCRIPTCHECK_THREADS);
    if (nScriptCheckThreads <= 0)
        nScriptCheckThreads += boost::thread::hardware_concurrency();
    if (nScriptCheckThreads <= 1)
        nScriptCheckThreads = 0;
    else if (nScriptCheckThreads > MAX_SCRIPTCHECK_THREADS)
        nScriptCheckThreads = MAX_SCRIPTCHECK_THREADS;

    setvbuf(stdout, NULL, _IOLBF, 0); /// ***TODO*** do we still need this after -printtoconsole is gone?

    // Staking needs a CWallet instance, so make sure wallet is enabled
#ifdef ENABLE_WALLET
    bool fDisableWallet = GetBoolArg("-disablewallet", false);
    if (fDisableWallet) {
#endif
        if (SoftSetBoolArg("-staking", false))
            LogPrintf("AppInit2 : parameter interaction: wallet functionality not enabled -> setting -staking=0\n");
#ifdef ENABLE_WALLET
    }
#endif

    nConnectTimeout = GetArg("-timeout", DEFAULT_CONNECT_TIMEOUT);
    if (nConnectTimeout <= 0)
        nConnectTimeout = DEFAULT_CONNECT_TIMEOUT;

    // Fee-per-kilobyte amount considered the same as "free"
    // If you are mining, be careful setting this:
    // if you set it to zero then
    // a transaction spammer can cheaply fill blocks using
    // 1-satoshi-fee transactions. It should be set above the real
    // cost to you of processing a transaction.
    if (mapArgs.count("-minrelaytxfee")) {
        CAmount n = 0;
        if (ParseMoney(mapArgs["-minrelaytxfee"], n) && n > 0)
            ::minRelayTxFee = CFeeRate(n);
        else
            return UIError(AmountErrMsg("minrelaytxfee", mapArgs["-minrelaytxfee"]));
    }

#ifdef ENABLE_WALLET
    std::string strWalletFile = GetArg("-wallet", "wallet.dat");
    if (!CWallet::ParameterInteraction())
        return false;
#endif // ENABLE_WALLET

    fIsBareMultisigStd = GetBoolArg("-permitbaremultisig", true) != 0;
    nMaxDatacarrierBytes = GetArg("-datacarriersize", nMaxDatacarrierBytes);

    if (GetBoolArg("-peerbloomfilters", DEFAULT_PEERBLOOMFILTERS))
        nLocalServices |= NODE_BLOOM;

    nMaxTipAge = GetArg("-maxtipage", DEFAULT_MAX_TIP_AGE);

    // ********************************************************* Step 4: application initialization: dir lock, daemonize, pidfile, debug log

    // Initialize elliptic curve code
    RandomInit();
    ECC_Start();
    globalVerifyHandle.reset(new ECCVerifyHandle());

    // Sanity check
    if (!InitSanityCheck())
        return UIError(_("Initialization sanity check failed. Sap is shutting down."));

    std::string strDataDir = GetDataDir().string();
#ifdef ENABLE_WALLET
    // Wallet file must be a plain filename without a directory
    if (strWalletFile != boost::filesystem::basename(strWalletFile) + boost::filesystem::extension(strWalletFile))
        return UIError(strprintf(_("Wallet %s resides outside data directory %s"), strWalletFile, strDataDir));
#endif
    // Make sure only a single Sap process is using the data directory.
    boost::filesystem::path pathLockFile = GetDataDir() / ".lock";
    FILE* file = fopen(pathLockFile.string().c_str(), "a"); // empty lock file; created if it doesn't exist.
    if (file) fclose(file);
    static boost::interprocess::file_lock lock(pathLockFile.string().c_str());

    // Wait maximum 10 seconds if an old wallet is still running. Avoids lockup during restart
    if (!lock.timed_lock(boost::get_system_time() + boost::posix_time::seconds(10)))
        return UIError(strprintf(_("Cannot obtain a lock on data directory %s. Sap is probably already running."), strDataDir));

#ifndef WIN32
    CreatePidFile(GetPidFile(), getpid());
#endif
    if (g_logger->m_print_to_file) {
        if (GetBoolArg("-shrinkdebugfile", g_logger->DefaultShrinkDebugFile()))
            g_logger->ShrinkDebugFile();
        if (!g_logger->OpenDebugLog())
            return UIError(strprintf("Could not open debug log file %s", g_logger->m_file_path.string()));
    }
#ifdef ENABLE_WALLET
    LogPrintf("Using BerkeleyDB version %s\n", DbEnv::version(0, 0, 0));
#endif
    if (!g_logger->m_log_timestamps)
        LogPrintf("Startup time: %s\n", DateTimeStrFormat("%Y-%m-%d %H:%M:%S", GetTime()));
    LogPrintf("Default data directory %s\n", GetDefaultDataDir().string());
    LogPrintf("Using data directory %s\n", strDataDir);
    LogPrintf("Using config file %s\n", GetConfigFile().string());
    LogPrintf("Using at most %i connections (%i file descriptors available)\n", nMaxConnections, nFD);
    std::ostringstream strErrors;

    LogPrintf("Using %u threads for script verification\n", nScriptCheckThreads);
    if (nScriptCheckThreads) {
        for (int i = 0; i < nScriptCheckThreads - 1; i++)
            threadGroup.create_thread(&ThreadScriptCheck);
    }

    if (mapArgs.count("-sporkkey")) // spork priv key
    {
        if (!sporkManager.SetPrivKey(GetArg("-sporkkey", "")))
            return UIError(_("Unable to sign spork message, wrong key?"));
    }

    // Start the lightweight task scheduler thread
    CScheduler::Function serviceLoop = boost::bind(&CScheduler::serviceQueue, &scheduler);
    threadGroup.create_thread(boost::bind(&TraceThread<CScheduler::Function>, "scheduler", serviceLoop));

    /* Start the RPC server already.  It will be started in "warmup" mode
     * and not really process calls already (but it will signify connections
     * that the server is there and will be ready later).  Warmup mode will
     * be disabled when initialisation is finished.
     */
    if (GetBoolArg("-server", false)) {
        uiInterface.InitMessage.connect(SetRPCWarmupStatus);
        if (!AppInitServers())
            return UIError(_("Unable to start HTTP server. See debug log for details."));
    }

// ********************************************************* Step 5: Backup wallet and verify wallet database integrity
#ifdef ENABLE_WALLET
    if (!fDisableWallet) {
        boost::filesystem::path backupDir = GetDataDir() / "backups";
        if (!boost::filesystem::exists(backupDir)) {
            // Always create backup folder to not confuse the operating system's file browser
            boost::filesystem::create_directories(backupDir);
        }
        nWalletBackups = GetArg("-createwalletbackups", 10);
        nWalletBackups = std::max(0, std::min(10, nWalletBackups));
        if (nWalletBackups > 0) {
            if (boost::filesystem::exists(backupDir)) {
                // Create backup of the wallet
                std::string dateTimeStr = DateTimeStrFormat(".%Y-%m-%d-%H-%M", GetTime());
                std::string backupPathStr = backupDir.string();
                backupPathStr += "/" + strWalletFile;
                std::string sourcePathStr = GetDataDir().string();
                sourcePathStr += "/" + strWalletFile;
                boost::filesystem::path sourceFile = sourcePathStr;
                boost::filesystem::path backupFile = backupPathStr + dateTimeStr;
                sourceFile.make_preferred();
                backupFile.make_preferred();
                if (boost::filesystem::exists(sourceFile)) {
#if BOOST_VERSION >= 105800
                    try {
                        boost::filesystem::copy_file(sourceFile, backupFile);
                        LogPrintf("Creating backup of %s -> %s\n", sourceFile, backupFile);
                    } catch (const boost::filesystem::filesystem_error& error) {
                        LogPrintf("Failed to create backup %s\n", error.what());
                    }
#else
                    std::ifstream src(sourceFile.string(), std::ios::binary);
                    std::ofstream dst(backupFile.string(), std::ios::binary);
                    dst << src.rdbuf();
#endif
                }
                // Keep only the last 10 backups, including the new one of course
                typedef std::multimap<std::time_t, boost::filesystem::path> folder_set_t;
                folder_set_t folder_set;
                boost::filesystem::directory_iterator end_iter;
                boost::filesystem::path backupFolder = backupDir.string();
                backupFolder.make_preferred();
                // Build map of backup files for current(!) wallet sorted by last write time
                boost::filesystem::path currentFile;
                for (boost::filesystem::directory_iterator dir_iter(backupFolder); dir_iter != end_iter; ++dir_iter) {
                    // Only check regular files
                    if (boost::filesystem::is_regular_file(dir_iter->status())) {
                        currentFile = dir_iter->path().filename();
                        // Only add the backups for the current wallet, e.g. wallet.dat.*
                        if (dir_iter->path().stem().string() == strWalletFile) {
                            folder_set.insert(folder_set_t::value_type(boost::filesystem::last_write_time(dir_iter->path()), *dir_iter));
                        }
                    }
                }
                // Loop backward through backup files and keep the N newest ones (1 <= N <= 10)
                int counter = 0;
                BOOST_REVERSE_FOREACH (PAIRTYPE(const std::time_t, boost::filesystem::path) file, folder_set) {
                    counter++;
                    if (counter > nWalletBackups) {
                        // More than nWalletBackups backups: delete oldest one(s)
                        try {
                            boost::filesystem::remove(file.second);
                            LogPrintf("Old backup deleted: %s\n", file.second);
                        } catch (const boost::filesystem::filesystem_error& error) {
                            LogPrintf("Failed to delete backup %s\n", error.what());
                        }
                    }
                }
            }
        }

        if (GetBoolArg("-resync", false)) {
            uiInterface.InitMessage(_("Preparing for resync..."));
            // Delete the local blockchain folders to force a resync from scratch to get a consitent blockchain-state
            boost::filesystem::path blocksDir = GetDataDir() / "blocks";
            boost::filesystem::path chainstateDir = GetDataDir() / "chainstate";
            boost::filesystem::path sporksDir = GetDataDir() / "sporks";
            boost::filesystem::path zerocoinDir = GetDataDir() / "zerocoin";

            LogPrintf("Deleting blockchain folders blocks, chainstate, sporks and zerocoin\n");
            // We delete in 4 individual steps in case one of the folder is missing already
            try {
                if (boost::filesystem::exists(blocksDir)){
                    boost::filesystem::remove_all(blocksDir);
                    LogPrintf("-resync: folder deleted: %s\n", blocksDir.string().c_str());
                }

                if (boost::filesystem::exists(chainstateDir)){
                    boost::filesystem::remove_all(chainstateDir);
                    LogPrintf("-resync: folder deleted: %s\n", chainstateDir.string().c_str());
                }

                if (boost::filesystem::exists(sporksDir)){
                    boost::filesystem::remove_all(sporksDir);
                    LogPrintf("-resync: folder deleted: %s\n", sporksDir.string().c_str());
                }

                if (boost::filesystem::exists(zerocoinDir)){
                    boost::filesystem::remove_all(zerocoinDir);
                    LogPrintf("-resync: folder deleted: %s\n", zerocoinDir.string().c_str());
                }
            } catch (const boost::filesystem::filesystem_error& error) {
                LogPrintf("Failed to delete blockchain folders %s\n", error.what());
            }
        }

        LogPrintf("Using wallet %s\n", strWalletFile);
        uiInterface.InitMessage(_("Verifying wallet..."));

        if (!bitdb.Open(GetDataDir())) {
            // try moving the database env out of the way
            boost::filesystem::path pathDatabase = GetDataDir() / "database";
            boost::filesystem::path pathDatabaseBak = GetDataDir() / strprintf("database.%d.bak", GetTime());
            try {
                boost::filesystem::rename(pathDatabase, pathDatabaseBak);
                LogPrintf("Moved old %s to %s. Retrying.\n", pathDatabase.string(), pathDatabaseBak.string());
            } catch (const boost::filesystem::filesystem_error& error) {
                // failure is ok (well, not really, but it's not worse than what we started with)
            }

            // try again
            if (!bitdb.Open(GetDataDir())) {
                // if it still fails, it probably means we can't even create the database env
                std::string msg = strprintf(_("Error initializing wallet database environment %s!"), strDataDir);
                return UIError(msg);
            }
        }

        if (GetBoolArg("-salvagewallet", false)) {
            // Recover readable keypairs:
            if (!CWalletDB::Recover(bitdb, strWalletFile, true))
                return false;
        }

        if (boost::filesystem::exists(GetDataDir() / strWalletFile)) {
            CDBEnv::VerifyResult r = bitdb.Verify(strWalletFile, CWalletDB::Recover);
            if (r == CDBEnv::RECOVER_OK) {
                std::string msg = strprintf(_("Warning: wallet.dat corrupt, data salvaged!"
                                         " Original wallet.dat saved as wallet.{timestamp}.bak in %s; if"
                                         " your balance or transactions are incorrect you should"
                                         " restore from a backup."),
                    strDataDir);
                UIWarning(msg);
            }
            if (r == CDBEnv::RECOVER_FAIL)
                return UIError(_("wallet.dat corrupt, salvage failed"));
        }

    }  // (!fDisableWallet)
#endif // ENABLE_WALLET

    // ********************************************************* Step 6: network initialization

    RegisterNodeSignals(GetNodeSignals());

    // sanitize comments per BIP-0014, format user agent and check total size
    std::vector<std::string> uacomments;
    for (const std::string& cmt : mapMultiArgs["-uacomment"]) {
        if (cmt != SanitizeString(cmt, SAFE_CHARS_UA_COMMENT))
            return UIError(strprintf(_("User Agent comment (%s) contains unsafe characters."), cmt));
        uacomments.push_back(cmt);
    }

    // format user agent, check total size
    strSubVersion = FormatSubVersion(CLIENT_NAME, CLIENT_VERSION, uacomments);
    if (strSubVersion.size() > MAX_SUBVERSION_LENGTH) {
        return UIError(strprintf(_("Total length of network version string (%i) exceeds maximum length (%i). Reduce the number or size of uacomments."),
            strSubVersion.size(), MAX_SUBVERSION_LENGTH));
    }

    if (mapArgs.count("-onlynet")) {
        std::set<enum Network> nets;
        for (std::string snet : mapMultiArgs["-onlynet"]) {
            enum Network net = ParseNetwork(snet);
            if (net == NET_UNROUTABLE)
                return UIError(strprintf(_("Unknown network specified in -onlynet: '%s'"), snet));
            nets.insert(net);
        }
        for (int n = 0; n < NET_MAX; n++) {
            enum Network net = (enum Network)n;
            if (!nets.count(net))
                SetLimited(net);
        }
    }

    if (mapArgs.count("-whitelist")) {
        for (const std::string& net : mapMultiArgs["-whitelist"]) {
            CSubNet subnet(net);
            if (!subnet.IsValid())
                return UIError(strprintf(_("Invalid netmask specified in -whitelist: '%s'"), net));
            CNode::AddWhitelistedRange(subnet);
        }
    }

    // Check for host lookup allowed before parsing any network related parameters
    fNameLookup = GetBoolArg("-dns", DEFAULT_NAME_LOOKUP);

    bool proxyRandomize = GetBoolArg("-proxyrandomize", true);
    // -proxy sets a proxy for all outgoing network traffic
    // -noproxy (or -proxy=0) as well as the empty string can be used to not set a proxy, this is the default
    std::string proxyArg = GetArg("-proxy", "");
    SetLimited(NET_TOR);
    if (proxyArg != "" && proxyArg != "0") {
        CService proxyAddr;
        if (!Lookup(proxyArg.c_str(), proxyAddr, 9050, fNameLookup)) {
            return UIError(strprintf(_("Lookup(): Invalid -proxy address or hostname: '%s'"), proxyArg));
        }

        proxyType addrProxy = proxyType(proxyAddr, proxyRandomize);
        if (!addrProxy.IsValid())
            return UIError(strprintf(_("isValid(): Invalid -proxy address or hostname: '%s'"), proxyArg));

        SetProxy(NET_IPV4, addrProxy);
        SetProxy(NET_IPV6, addrProxy);
        SetProxy(NET_TOR, addrProxy);
        SetNameProxy(addrProxy);
        SetLimited(NET_TOR, false); // by default, -proxy sets onion as reachable, unless -noonion later
    }

    // -onion can be used to set only a proxy for .onion, or override normal proxy for .onion addresses
    // -noonion (or -onion=0) disables connecting to .onion entirely
    // An empty string is used to not override the onion proxy (in which case it defaults to -proxy set above, or none)
    std::string onionArg = GetArg("-onion", "");
    if (onionArg != "") {
        if (onionArg == "0") { // Handle -noonion/-onion=0
            SetLimited(NET_TOR); // set onions as unreachable
        } else {
            CService onionProxy;
            if (!Lookup(onionArg.c_str(), onionProxy, 9050, fNameLookup)) {
                return UIError(strprintf(_("Invalid -onion address or hostname: '%s'"), onionArg));
            }
            proxyType addrOnion = proxyType(onionProxy, proxyRandomize);
            if (!addrOnion.IsValid())
                return UIError(strprintf(_("Invalid -onion address or hostname: '%s'"), onionArg));
            SetProxy(NET_TOR, addrOnion);
            SetLimited(NET_TOR, false);
        }
    }

    // see Step 2: parameter interactions for more information about these
    fListen = GetBoolArg("-listen", DEFAULT_LISTEN);
    fDiscover = GetBoolArg("-discover", true);

    bool fBound = false;
    if (fListen) {
        if (mapArgs.count("-bind") || mapArgs.count("-whitebind")) {
            for (std::string strBind : mapMultiArgs["-bind"]) {
                CService addrBind;
                if (!Lookup(strBind.c_str(), addrBind, GetListenPort(), false))
                    return UIError(ResolveErrMsg("bind", strBind));
                fBound |= Bind(addrBind, (BF_EXPLICIT | BF_REPORT_ERROR));
            }
            for (std::string strBind : mapMultiArgs["-whitebind"]) {
                CService addrBind;
                if (!Lookup(strBind.c_str(), addrBind, 0, false))
                    return UIError(ResolveErrMsg("whitebind", strBind));
                if (addrBind.GetPort() == 0)
                    return UIError(strprintf(_("Need to specify a port with -whitebind: '%s'"), strBind));
                fBound |= Bind(addrBind, (BF_EXPLICIT | BF_REPORT_ERROR | BF_WHITELIST));
            }
        } else {
            struct in_addr inaddr_any;
            inaddr_any.s_addr = INADDR_ANY;
            fBound |= Bind(CService((in6_addr)IN6ADDR_ANY_INIT, GetListenPort()), BF_NONE);
            fBound |= Bind(CService(inaddr_any, GetListenPort()), !fBound ? BF_REPORT_ERROR : BF_NONE);
        }
        if (!fBound)
            return UIError(_("Failed to listen on any port. Use -listen=0 if you want this."));
    }

    if (mapArgs.count("-externalip")) {
        for (std::string strAddr : mapMultiArgs["-externalip"]) {
            CService addrLocal;
            if (Lookup(strAddr.c_str(), addrLocal, GetListenPort(), fNameLookup) && addrLocal.IsValid())
                AddLocal(addrLocal,LOCAL_MANUAL);
            else
                return UIError(ResolveErrMsg("externalip", strAddr));
        }
    }

    for (std::string strDest : mapMultiArgs["-seednode"])
        AddOneShot(strDest);

#if ENABLE_ZMQ
    pzmqNotificationInterface = CZMQNotificationInterface::CreateWithArguments(mapArgs);

    if (pzmqNotificationInterface) {
        RegisterValidationInterface(pzmqNotificationInterface);
    }
#endif

    // ********************************************************* Step 7: load block chain

    fReindex = GetBoolArg("-reindex", false);

    // Create blocks directory if it doesn't already exist
    boost::filesystem::create_directories(GetDataDir() / "blocks");

    // cache size calculations
    size_t nTotalCache = (GetArg("-dbcache", nDefaultDbCache) << 20);
    if (nTotalCache < (nMinDbCache << 20))
        nTotalCache = (nMinDbCache << 20); // total cache cannot be less than nMinDbCache
    else if (nTotalCache > (nMaxDbCache << 20))
        nTotalCache = (nMaxDbCache << 20); // total cache cannot be greater than nMaxDbCache
    size_t nBlockTreeDBCache = nTotalCache / 8;
    if (nBlockTreeDBCache > (1 << 21) && !GetBoolArg("-txindex", true))
        nBlockTreeDBCache = (1 << 21); // block tree db cache shouldn't be larger than 2 MiB
    nTotalCache -= nBlockTreeDBCache;
    size_t nCoinDBCache = nTotalCache / 2; // use half of the remaining cache for coindb cache
    nTotalCache -= nCoinDBCache;
    nCoinCacheSize = nTotalCache / 300; // coins in memory require around 300 bytes

    bool fLoaded = false;
    while (!fLoaded && !ShutdownRequested()) {
        bool fReset = fReindex;
        std::string strLoadError;

        uiInterface.InitMessage(_("Loading block index..."));

        do {
            const int64_t load_block_index_start_time = GetTimeMillis();

            try {
                UnloadBlockIndex();
                delete pcoinsTip;
                delete pcoinsdbview;
                delete pcoinscatcher;
                delete pblocktree;
                delete zerocoinDB;
                delete pSporkDB;

                //PIVX specific: zerocoin and spork DB's
                pSporkDB = new CSporkDB(0, false, false);

                pblocktree = new CBlockTreeDB(nBlockTreeDBCache, false, fReindex);
                pcoinsdbview = new CCoinsViewDB(nCoinDBCache, false, fReindex);
                pcoinscatcher = new CCoinsViewErrorCatcher(pcoinsdbview);
                pcoinsTip = new CCoinsViewCache(pcoinscatcher);

                if (fReindex)
                    pblocktree->WriteReindexing(true);

                // End loop if shutdown was requested
                if (ShutdownRequested()) break;

                // PIVX: load previous sessions sporks if we have them.
                uiInterface.InitMessage(_("Loading sporks..."));
                sporkManager.LoadSporksFromDB();

                uiInterface.InitMessage(_("Loading block index..."));
                std::string strBlockIndexError = "";
                if (!LoadBlockIndex(strBlockIndexError)) {
                    if (ShutdownRequested()) break;
                    strLoadError = _("Error loading block database");
                    strLoadError = strprintf("%s : %s", strLoadError, strBlockIndexError);
                    break;
                }

                const Consensus::Params& consensus = Params().GetConsensus();

                // If the loaded chain has a wrong genesis, bail out immediately
                // (we're likely using a testnet datadir, or the other way around).
                if (!mapBlockIndex.empty() && mapBlockIndex.count(Params().GetConsensus().hashGenesisBlock) == 0) {
                    strLoadError = _("Incorrect or no genesis block found. Wrong datadir for network?");
                    break;
                }

                // Initialize the block index (no-op if non-empty database was already loaded)
                if (!InitBlockIndex()) {
                    strLoadError = _("Error initializing block database");
                    break;
                }

                // Check for changed -txindex state
                if (fTxIndex != GetBoolArg("-txindex", true)) {
                    strLoadError = _("You need to rebuild the database using -reindex to change -txindex");
                    break;
                }

                uiInterface.InitMessage(_("Verifying blocks..."));
            } catch (std::exception& e) {
                LogPrintf("%s\n", e.what());
                strLoadError = _("Error opening block database");
                break;
            }

            fLoaded = true;
        } while (false);


        if (!fLoaded && !ShutdownRequested()) {
            // first suggest a reindex
            if (!fReset) {
                bool fRet = uiInterface.ThreadSafeMessageBox(
                    strLoadError + ".\n\n" + _("Do you want to rebuild the block database now?"),
                    "", CClientUIInterface::MSG_ERROR | CClientUIInterface::BTN_ABORT);
                if (fRet) {
                    fReindex = true;
                    fRequestShutdown = false;
                } else {
                    LogPrintf("Aborted block database rebuild. Exiting.\n");
                    return false;
                }
            } else {
                return UIError(strLoadError);
            }
        }
    }

    // As LoadBlockIndex can take several minutes, it's possible the user
    // requested to kill the GUI during the last operation. If so, exit.
    // As the program has not fully started yet, Shutdown() is possibly overkill.
    if (ShutdownRequested()) {
        LogPrintf("Shutdown requested. Exiting.\n");
        return false;
    }

    boost::filesystem::path est_path = GetDataDir() / FEE_ESTIMATES_FILENAME;
    CAutoFile est_filein(fopen(est_path.string().c_str(), "rb"), SER_DISK, CLIENT_VERSION);
    // Allowed to fail as this file IS missing on first startup.
    if (!est_filein.IsNull())
        mempool.ReadFeeEstimates(est_filein);
    fFeeEstimatesInitialized = true;

// ********************************************************* Step 8: load wallet
#ifdef ENABLE_WALLET
    if (fDisableWallet) {
        pwalletMain = NULL;
        zwalletMain = NULL;
        LogPrintf("Wallet disabled!\n");
    } else {
        // needed to restore wallet transaction meta data after -zapwallettxes
        std::vector<CWalletTx> vWtx;

        if (GetBoolArg("-zapwallettxes", false)) {
            uiInterface.InitMessage(_("Zapping all transactions from wallet..."));

            pwalletMain = new CWallet(strWalletFile);
            DBErrors nZapWalletRet = pwalletMain->ZapWalletTx(vWtx);
            if (nZapWalletRet != DB_LOAD_OK) {
                uiInterface.InitMessage(_("Error loading wallet.dat: Wallet corrupted"));
                return false;
            }

            delete pwalletMain;
            pwalletMain = NULL;
        }

        uiInterface.InitMessage(_("Loading wallet..."));
        fVerifyingBlocks = true;

        const int64_t nWalletStartTime = GetTimeMillis();
        bool fFirstRun = true;
        pwalletMain = new CWallet(strWalletFile);
        DBErrors nLoadWalletRet = pwalletMain->LoadWallet(fFirstRun);
        if (nLoadWalletRet != DB_LOAD_OK) {
            if (nLoadWalletRet == DB_CORRUPT)
                strErrors << _("Error loading wallet.dat: Wallet corrupted") << "\n";
            else if (nLoadWalletRet == DB_NONCRITICAL_ERROR) {
                std::string msg(_("Warning: error reading wallet.dat! All keys read correctly, but transaction data"
                             " or address book entries might be missing or incorrect."));
                UIWarning(msg);
            } else if (nLoadWalletRet == DB_TOO_NEW)
                strErrors << _("Error loading wallet.dat: Wallet requires newer version of Sap") << "\n";
            else if (nLoadWalletRet == DB_NEED_REWRITE) {
                strErrors << _("Wallet needed to be rewritten: restart Sap to complete") << "\n";
                LogPrintf("%s", strErrors.str());
                return UIError(strErrors.str());
            } else
                strErrors << _("Error loading wallet.dat") << "\n";
        }

        int prev_version = pwalletMain->GetVersion();

        // Forced upgrade
        const bool fLegacyWallet = GetBoolArg("-legacywallet", false);
        if (GetBoolArg("-upgradewallet", fFirstRun && !fLegacyWallet)) {
            if (prev_version <= FEATURE_PRE_PIVX && pwalletMain->IsLocked()) {
                // Cannot upgrade a locked wallet
                std::string strProblem = "Cannot upgrade a locked wallet.\n";
                strErrors << _("Error: ") << strProblem;
                LogPrintf("%s", strErrors.str());
                return UIError(strProblem);
            }

            int nMaxVersion = GetArg("-upgradewallet", 0);
            if (nMaxVersion == 0) // the -upgradewallet without argument case
            {
                LogPrintf("Performing wallet upgrade to %i\n", FEATURE_LATEST);
                nMaxVersion = FEATURE_LATEST;
                pwalletMain->SetMinVersion(FEATURE_LATEST); // permanently upgrade the wallet immediately
            } else
                LogPrintf("Allowing wallet upgrade up to %i\n", nMaxVersion);
            if (nMaxVersion < pwalletMain->GetVersion())
                strErrors << _("Cannot downgrade wallet") << "\n";
            pwalletMain->SetMaxVersion(nMaxVersion);
        }

        // Upgrade to HD only if explicit upgrade was requested
        if (GetBoolArg("-upgradewallet", false)) {
            std::string upgradeError;
            if (!pwalletMain->Upgrade(upgradeError, prev_version)) {
                strErrors << upgradeError << "\n";
            }
        }

        if (fFirstRun) {
            if (!fLegacyWallet) {
                // Create new HD Wallet
                LogPrintf("Creating HD Wallet\n");
                // Ensure this wallet.dat can only be opened by clients supporting HD.
                pwalletMain->SetMinVersion(FEATURE_LATEST);
                pwalletMain->SetupSPKM();
            } else {
                if (!Params().IsRegTestNet()) {
                    std::string strProblem = "Legacy wallets can only be created on RegTest.\n";
                    strErrors << _("Error: ") << strProblem;
                    LogPrintf("%s", strErrors.str());
                    return UIError(strProblem);
                }
                // Create legacy wallet
                LogPrintf("Creating Pre-HD Wallet\n");
                pwalletMain->SetMaxVersion(FEATURE_PRE_PIVX);
            }

            // Top up the keypool
            if (!pwalletMain->TopUpKeyPool()) {
                // Error generating keys
                UIError(_("Unable to generate initial key") += "\n");
                return error("%s %s", __func__ , "Unable to generate initial key");
            }

            pwalletMain->SetBestChain(chainActive.GetLocator());
        }

        LogPrintf("Init errors: %s\n", strErrors.str());
        LogPrintf("Wallet completed loading in %15dms\n", GetTimeMillis() - nWalletStartTime);
        zwalletMain = new CzPIVWallet(pwalletMain);
        pwalletMain->setZWallet(zwalletMain);

        RegisterValidationInterface(pwalletMain);

        CBlockIndex* pindexRescan = chainActive.Tip();
        if (GetBoolArg("-rescan", false))
            pindexRescan = chainActive.Genesis();
        else {
            CWalletDB walletdb(strWalletFile);
            CBlockLocator locator;
            if (walletdb.ReadBestBlock(locator))
                pindexRescan = FindForkInGlobalIndex(chainActive, locator);
            else
                pindexRescan = chainActive.Genesis();
        }
        if (chainActive.Tip() && chainActive.Tip() != pindexRescan) {
            uiInterface.InitMessage(_("Rescanning..."));
            LogPrintf("Rescanning last %i blocks (from block %i)...\n", chainActive.Height() - pindexRescan->nHeight, pindexRescan->nHeight);
            const int64_t nWalletRescanTime = GetTimeMillis();
            if (pwalletMain->ScanForWalletTransactions(pindexRescan, true, true) == -1) {
                return error("Shutdown requested over the txs scan. Exiting.");
            }
            LogPrintf("Rescan completed in %15dms\n", GetTimeMillis() - nWalletRescanTime);
            pwalletMain->SetBestChain(chainActive.GetLocator());
            nWalletDBUpdated++;

            // Restore wallet transaction metadata after -zapwallettxes=1
            if (GetBoolArg("-zapwallettxes", false) && GetArg("-zapwallettxes", "1") != "2") {
                CWalletDB walletdb(strWalletFile);
                for (const CWalletTx& wtxOld : vWtx) {
                    uint256 hash = wtxOld.GetHash();
                    std::map<uint256, CWalletTx>::iterator mi = pwalletMain->mapWallet.find(hash);
                    if (mi != pwalletMain->mapWallet.end()) {
                        const CWalletTx* copyFrom = &wtxOld;
                        CWalletTx* copyTo = &mi->second;
                        copyTo->mapValue = copyFrom->mapValue;
                        copyTo->vOrderForm = copyFrom->vOrderForm;
                        copyTo->nTimeReceived = copyFrom->nTimeReceived;
                        copyTo->nTimeSmart = copyFrom->nTimeSmart;
                        copyTo->fFromMe = copyFrom->fFromMe;
                        copyTo->strFromAccount = copyFrom->strFromAccount;
                        copyTo->nOrderPos = copyFrom->nOrderPos;
                        copyTo->WriteToDisk(&walletdb);
                    }
                }
            }
        }
        fVerifyingBlocks = false;

    }  // (!fDisableWallet)
#else  // ENABLE_WALLET
    LogPrintf("No wallet compiled in!\n");
#endif // !ENABLE_WALLET
    // ********************************************************* Step 9: import blocks

    if (!CheckDiskSpace())
        return false;

    if (mapArgs.count("-blocknotify"))
        uiInterface.NotifyBlockTip.connect(BlockNotifyCallback);

    if (mapArgs.count("-blocksizenotify"))
        uiInterface.NotifyBlockSize.connect(BlockSizeNotifyCallback);

    // scan for better chains in the block chain database, that are not yet connected in the active best chain
    CValidationState state;
    if (!ActivateBestChain(state))
        strErrors << "Failed to connect best block";
    // update g_best_block if needed
    {
        LOCK(g_best_block_mutex);
        if (g_best_block.IsNull() && chainActive.Tip()) {
            g_best_block = chainActive.Tip()->GetBlockHash();
            g_best_block_cv.notify_all();
        }
    }

    std::vector<boost::filesystem::path> vImportFiles;
    if (mapArgs.count("-loadblock")) {
        for (std::string strFile : mapMultiArgs["-loadblock"])
            vImportFiles.push_back(strFile);
    }
    threadGroup.create_thread(boost::bind(&ThreadImport, vImportFiles));
    if (chainActive.Tip() == NULL) {
        LogPrintf("Waiting for genesis block to be imported...\n");
        while (!fRequestShutdown && chainActive.Tip() == NULL)
            MilliSleep(10);
    }

    // ********************************************************* Step 10: setup layer 2 data

    uiInterface.InitMessage(_("Loading masternode cache..."));

    CMasternodeDB mndb;
    CMasternodeDB::ReadResult readResult = mndb.Read(mnodeman);
    if (readResult == CMasternodeDB::FileError)
        LogPrintf("Missing masternode cache file - mncache.dat, will try to recreate\n");
    else if (readResult != CMasternodeDB::Ok) {
        LogPrintf("Error reading mncache.dat: ");
        if (readResult == CMasternodeDB::IncorrectFormat)
            LogPrintf("magic is ok but data has invalid format, will try to recreate\n");
        else
            LogPrintf("file format is unknown or invalid, please fix it manually\n");
    }

    uiInterface.InitMessage(_("Loading budget cache..."));

    CBudgetDB budgetdb;
    CBudgetDB::ReadResult readResult2 = budgetdb.Read(budget);

    if (readResult2 == CBudgetDB::FileError)
        LogPrintf("Missing budget cache - budget.dat, will try to recreate\n");
    else if (readResult2 != CBudgetDB::Ok) {
        LogPrintf("Error reading budget.dat: ");
        if (readResult2 == CBudgetDB::IncorrectFormat)
            LogPrintf("magic is ok but data has invalid format, will try to recreate\n");
        else
            LogPrintf("file format is unknown or invalid, please fix it manually\n");
    }

    //flag our cached items so we send them to our peers
    budget.ResetSync();
    budget.ClearSeen();


    uiInterface.InitMessage(_("Loading masternode payment cache..."));

    CMasternodePaymentDB mnpayments;
    CMasternodePaymentDB::ReadResult readResult3 = mnpayments.Read(masternodePayments);

    if (readResult3 == CMasternodePaymentDB::FileError)
        LogPrintf("Missing masternode payment cache - mnpayments.dat, will try to recreate\n");
    else if (readResult3 != CMasternodePaymentDB::Ok) {
        LogPrintf("Error reading mnpayments.dat: ");
        if (readResult3 == CMasternodePaymentDB::IncorrectFormat)
            LogPrintf("magic is ok but data has invalid format, will try to recreate\n");
        else
            LogPrintf("file format is unknown or invalid, please fix it manually\n");
    }

    fMasterNode = GetBoolArg("-masternode", false);

    if ((fMasterNode || masternodeConfig.getCount() > -1) && fTxIndex == false) {
        return UIError("Enabling Masternode support requires turning on transaction indexing."
                         "Please add txindex=1 to your configuration and start with -reindex");
    }

    if (fMasterNode) {
        LogPrintf("IS MASTER NODE\n");
        strMasterNodeAddr = GetArg("-masternodeaddr", "");

        LogPrintf(" addr %s\n", strMasterNodeAddr.c_str());

        if (!strMasterNodeAddr.empty()) {
            CService addrTest = CService(strMasterNodeAddr);
            if (!addrTest.IsValid()) {
                return UIError("Invalid -masternodeaddr address: " + strMasterNodeAddr);
            }
        }

        strMasterNodePrivKey = GetArg("-masternodeprivkey", "");
        if (!strMasterNodePrivKey.empty()) {
            std::string errorMessage;

            CKey key;
            CPubKey pubkey;

            if (!CMessageSigner::GetKeysFromSecret(strMasterNodePrivKey, key, pubkey)) {
                return UIError(_("Invalid masternodeprivkey. Please see documenation."));
            }

            activeMasternode.pubKeyMasternode = pubkey;

        } else {
            return UIError(_("You must specify a masternodeprivkey in the configuration. Please see documentation for help."));
        }
    }

    //get the mode of budget voting for this masternode
    strBudgetMode = GetArg("-budgetvotemode", "auto");

    if (GetBoolArg("-mnconflock", true) && pwalletMain) {
        LOCK(pwalletMain->cs_wallet);
        LogPrintf("Locking Masternodes:\n");
        uint256 mnTxHash;
        for (CMasternodeConfig::CMasternodeEntry mne : masternodeConfig.getEntries()) {
            LogPrintf("  %s %s\n", mne.getTxHash(), mne.getOutputIndex());
            mnTxHash.SetHex(mne.getTxHash());
            COutPoint outpoint = COutPoint(mnTxHash, (unsigned int) std::stoul(mne.getOutputIndex().c_str()));
            pwalletMain->LockCoin(outpoint);
        }
    }

    fEnableSwiftTX = GetBoolArg("-enableswifttx", fEnableSwiftTX);
    nSwiftTXDepth = GetArg("-swifttxdepth", nSwiftTXDepth);
    nSwiftTXDepth = std::min(std::max(nSwiftTXDepth, 0), 60);

    //lite mode disables all Masternode related functionality
    fLiteMode = GetBoolArg("-litemode", false);
    if (fMasterNode && fLiteMode) {
        return UIError("You can not start a masternode in litemode");
    }

    LogPrintf("fLiteMode %d\n", fLiteMode);
    LogPrintf("nSwiftTXDepth %d\n", nSwiftTXDepth);
    LogPrintf("Budget Mode %s\n", strBudgetMode.c_str());

    threadGroup.create_thread(boost::bind(&ThreadCheckMasternodes));

    if (ShutdownRequested()) {
        LogPrintf("Shutdown requested. Exiting.\n");
        return false;
    }

    // ********************************************************* Step 11: start node

    if (!strErrors.str().empty())
        return UIError(strErrors.str());

    //// debug print
    LogPrintf("mapBlockIndex.size() = %u\n", mapBlockIndex.size());
    LogPrintf("chainActive.Height() = %d\n", chainActive.Height());
#ifdef ENABLE_WALLET
    {
        if (pwalletMain) {
            LOCK(pwalletMain->cs_wallet);
            LogPrintf("setKeyPool.size() = %u\n", pwalletMain ? pwalletMain->GetKeyPoolSize() : 0);
            LogPrintf("mapWallet.size() = %u\n", pwalletMain ? pwalletMain->mapWallet.size() : 0);
            LogPrintf("mapAddressBook.size() = %u\n", pwalletMain ? pwalletMain->mapAddressBook.size() : 0);
        }
    }
#endif

    if (GetBoolArg("-listenonion", DEFAULT_LISTEN_ONION))
        StartTorControl(threadGroup);

    StartNode(threadGroup, scheduler);

#ifdef ENABLE_WALLET
    // Generate coins in the background
    if (pwalletMain)
        GenerateBitcoins(GetBoolArg("-gen", false), pwalletMain, GetArg("-genproclimit", 1));
#endif

    // ********************************************************* Step 12: finished

    SetRPCWarmupFinished();
    uiInterface.InitMessage(_("Done loading"));

#ifdef ENABLE_WALLET
    if (pwalletMain) {
        // Add wallet transactions that aren't already in a block to mapTransactions
        pwalletMain->ReacceptWalletTransactions(/*fFirstLoad*/true);

        // Run a thread to flush wallet periodically
        threadGroup.create_thread(boost::bind(&ThreadFlushWalletDB, boost::ref(pwalletMain->strWalletFile)));

        // StakeMiner thread disabled by default on regtest
        if (GetBoolArg("-staking", !Params().IsRegTestNet())) {
            threadGroup.create_thread(boost::bind(&ThreadStakeMinter));
        }
    }
#endif


    return !fRequestShutdown;
}
